Biography

Sumit Karki received his Bachelor degree in Electrical Engineering from Kathmandu University, Dhulikhel, Nepal in 2010. He received his Master in Research on Information and Communication Technologies from Université catholique de Louvain, Louvain-la-Neuve, Belgium and Universitat Politecnica de Catalunya, Barcelona, Spain on an Erasmus Mundus grant to pursue the double degree from 2011 to 2013. He completed his PhD from Universite catholique de Louvain in December 2018.

Research Interests

His main research interests include beamforming architectures for space antennas, antenna design, and fast numerical techniques using inhomogeneous plane waves and fast multipole algorithms.

Publication

  • [DOI] S. Karki, J. I. Echeveste Guzman, T. Pairon, and C. Craeye, “Sequentially Shifted Beamforming from a Conformed Conical Array,” in Proceedings of the 47th European Microwave Conference 2017, 2017.
    [Bibtex] 
    @inproceedings{boreal:195151,
 title = {Sequentially Shifted Beamforming from a Conformed Conical Array},
 author = {Karki, Sumit and Echeveste Guzman, Jose Ignacio and Pairon, Thomas and Craeye, Christophe},
 abstract = {A conical frustum array capable of beamforming in azimuth is proposed. The design exploits the embedded element pattern of a single facet of the conical frustum array to determine the number of consecutive facets required, and to ascertain the directions at which a handover to the next set of facets is required. A simple beamforming architecture is also presented, which can perform sequential shifting of facets with a minimal number of analog switches and 15 true-time delay lines to produce 36 beams. Such conical frustum array can easily communicate with or track objects beneath when attached to flying platforms.},
 Keywords = {Array signal processing ,    Azimuth ,    Directive antennas ,    Radio frequency ,    Phased arrays},
 language = {Anglais},
 booktitle = {Proceedings of the 47th European Microwave Conference 2017},
 doi = {10.23919/EURAD.2017.8249223},
 publisher = {IEEE},
 year = {2017},
 url = {http://hdl.handle.net/2078.1/195151}}
  • [DOI] S. Karki, C. Craeye, M. Mitrovic, and V. Dehant, “A conical frustum-type array devoted to a Mars-based transponder,” in Proceedings of the 2016 10th European Conference on Antennas and Propagation (EuCAP), 2016.
    [Bibtex] 
    @inproceedings{boreal:182090,
 title = {A conical frustum-type array devoted to a Mars-based transponder},
 author = {Karki, Sumit and Craeye, Christophe and Mitrovic, Michel and Dehant, Veronique},
 abstract = {A crossed slot circularly polarized antenna array conforming to a conical frustum is proposed for a Mars transponder. The cross-slot antenna element is aperture-coupled by a single stripline feed, and its properties are studied. Also, the entire slot antenna array fed with discrete delta-gap sources to produce circular polarization is also described. Eventually, the slot array would all be replaced by stripline feeds with phase control to perform analog beamforming.},
 language = {Anglais},
 booktitle = {Proceedings of the 2016 10th European Conference on Antennas and Propagation (EuCAP)},
 doi = {10.1109/EuCAP.2016.7481529},
 year = {2016},
 url = {http://hdl.handle.net/2078.1/182090}}
  • [DOI] E. Martini, S. Karki, C. Craeye, and S. Maci, “Error analysis of the harmonics-based plane wave method,” in Proceedings of the 2015 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2015.
    [Bibtex] 
    @inproceedings{boreal:182089,
 title = {Error analysis of the harmonics-based plane wave method},
 author = {Martini, Enrica and Karki, Sumit and Craeye, Christophe and Maci, Stefano},
 abstract = {Inhomegeneous plane waves are used to represent 2D and 3D Green's functions in free space. A special sampling scheme allows a compensation between aliasing and truncation errors. An error model is provided for the 2D and 3D cases. Very high accuracy is obtained with very few points in spectral domain, which confirms the sub-Nyquist nature of the approach.},
 language = {Anglais},
 booktitle = {Proceedings of the 2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)},
 doi = {10.1109/ICEAA.2015.7297371},
 year = {2015},
 url = {http://hdl.handle.net/2078.1/182089}}
  • [DOI] S. Karki and C. Craeye, “Macro Basis Function interactions accelerated with the Inhomogeneous Plane Waves,” in Proceedings of the 2015 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2015.
    [Bibtex] 
    @inproceedings{boreal:182088,
 title = {Macro Basis Function interactions accelerated with the Inhomogeneous Plane Waves},
 author = {Karki, Sumit and Craeye, Christophe},
 abstract = {This paper focuses on the direct computation of the interactions between the Macro Basis Functions (MBFs) defined on distinct sub-domains using their complex patterns. They are computed using a set of inhomogeneous plane waves, which can be viewed as an extension of the Fast Inhomogeneous Plane Wave Algorithm (FIPWA), using a new spectral-domain sampling. Examples of slot antennas and 3D frustum array are used to validate the proposed method.},
 language = {Anglais},
 booktitle = {Proceedings of the 2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)},
 doi = {10.1109/ICEAA.2015.7297329},
 year = {2015},
 url = {http://hdl.handle.net/2078.1/182088}}
  • K. Alkhalifeh, S. N. Jha, S. Karki, and C. Craeye, “On the Use of Contour-FFT for the MBF-based Analysis of Arrays of Antennas Placed Vertically Above a Multi-layered Substrate.” 2015.
    [Bibtex] 
    @inproceedings{boreal:162285,
 title = {On the Use of Contour-FFT for the MBF-based Analysis of Arrays of Antennas Placed Vertically Above a Multi-layered Substrate},
 author = {Alkhalifeh, Khaldoun and Jha, Shambhu Nath and Karki, Sumit and Craeye, Christophe},
 abstract = {A method is proposed for the fast Macro Basis Functions (MBFs) characterization of arrays of antennas placed vertically above a multi-layered substrate by using the Contour-Fast Fourier Transform (Contour-FFT) method. The presented work aims at accelerating the evaluation of interactions between the MBFs defined on the elements corresponding to antennas extending vertically above the ground. We first write a complex plane extension of the interaction between antennas via reflection by the ground. The calculation is then accelerated using the Contour-FFT. We exploit the Contour-FFT available for planar arrays to efficiently obtain the solution of the currents on the vertical antennas with the consideration of reflections from the semi-infinite ground. Results are presented and future perspectives are highlighted.},
 language = {Anglais},
 year = {2015},
 url = {http://hdl.handle.net/2078.1/162285}}
  • K. Alkhalifeh, S. N. Jha, S. Karki, and C. Craeye, “On the use of Contour-FFT for the MBF-based analysis of arrays of antennas placed vertically above a multi-layered substrate,” in Proceedings of the 9th European Conference on Antennas and Propagation – EUCAP 2015, 2015.
    [Bibtex] 
    @inproceedings{boreal:162816,
 title = {On the use of Contour-FFT for the MBF-based analysis of arrays of antennas placed vertically above a multi-layered substrate},
 author = {Alkhalifeh, Khaldoun and Jha, Shambhu Nath and Karki, Sumit and Craeye, Christophe},
 Keywords = {ICTEAM/ELEN , Antennas},
 language = {Anglais},
 booktitle = {Proceedings of the 9th European Conference on Antennas and Propagation - EUCAP 2015},
 publisher = {IEEE},
 year = {2015},
 url = {http://hdl.handle.net/2078.1/162816}}

Contact

Email : sumit.karki@uclouvain.be